The world's most innovative — or smallest — electric boiler?The world's most innovativesmallestmost innovative
electric boiler?

The AT Heating Module is an exceptionally small boiler that runs on electricity alone.

It heats the water circulating in the heating system, which then heats your home through radiators, underfloor heating or other water-based heat emitters.

It does the same basic job as a conventional gas boiler — only without burning gas, without a chimney and without flue gas.

Yes. The AT Heating Module needs nothing but an electrical connection of adequate capacity.

It uses no gas or other fuel, and there is no combustion process in it.

If you don't need gas for cooking or hot water either, with the right system design gas can be dispensed with entirely in the property.

The smallest, 4 kW module measures 80 × 80 × 117 mm and weighs 3.2 kg. The larger versions have the same cross-section, they are only longer: the 12 kW one is 271 mm.

The small size is not just an eye-catching technical curiosity. It makes it possible to place the appliance right next to the buffer tank or the point of use.

This can mean shorter pipe runs, and less heat lost while the heat is being transported.

The output required depends not on the physical size of the appliance, but on the heat demand of the property.

Heating a properly insulated property of about 50–70 m² that meets today's thermal standards is a common use case.

A poorly insulated building with high heat loss, however, may need considerably more output for the same floor area. That is why sizing is always necessary.

The product is available in 4 kW, 6 kW and 12 kW versions among others, and further outputs may also be available.

We don't select the right model on floor area alone.

We also take into account the building's heat loss, insulation, windows and doors, ceiling height, heat emitter system and previous energy consumption.

No. The AT Heating Module is made for heating; it does not provide active cooling.

For cooling, a separate air conditioner or heat pump solution can be used.

In some homes it can be entirely rational for the AT Heating Module to do the heating, while the heat pump or air conditioner only handles cooling in summer.

In many cases, yes.

If your current system is water-based, the AT Heating Module can take over the role of the old gas boiler and heat the heating water from electricity.

Before switching, the property's heat demand, the required flow temperature, the heat emitters and the capacity of the electrical supply have to be checked.

In many cases yes, but this has to be checked technically.

The radiators can be used properly if they can deliver the heat needed to warm the property at the water temperature the AT Heating Module provides.

We don't automatically start by replacing radiators. First we examine whether the existing system is suitable for continued use.

Usually not.

If the existing water-based underfloor heating is in good condition, the pipework in the floor can continue to be used. In such cases it is typically the heat generator and the related mechanical components that have to be changed.

The exact arrangement can be determined after a technical inspection on site or based on the plans.

If the AT Heating Module takes over the gas boiler's heating job entirely, you no longer use gas for heating.

The energy needed appears on your electricity bill instead.

If you continue to use gas for cooking or hot water, the gas bill will of course not disappear completely.

Not necessarily.

If your gas boiler runs reliably, no major repair is due and you buy gas at a good price, it may be more economical to keep running it.

Switching can become particularly justified if you are facing a boiler replacement, an expensive chimney refurbishment, gas design work, permitting or a significant system rebuild.

We will also tell you if, based on the figures, it isn't worth switching yet.

With existing gas heating, one of the most useful figures is last year's gas consumption.

It gives a good starting point for estimating how much heat energy the property needed over a year.

We supplement this with the floor area, the insulation data, the windows and doors, the ceiling height and the characteristics of the current heating system.

The electricity bill you can expect depends primarily on the heat demand of the property.

Heating a well-insulated house takes far less energy than a poorly insulated building of the same size.

So instead of a generic consumption promise, we produce a calculation from your home's data. Before you decide, we also show how your total energy cost could change.

There is no single consumption figure that applies to every property.

Consumption is affected, among other things, by:

• the building's heat loss,
• the desired indoor temperature,
• the outside weather,
• the insulation,
• the heat emitter system,
• the control system,
• and the possibility of heat storage.

On the basis of annual gas consumption or a heat loss calculation, however, the amount of electricity required can be estimated well in advance.

In a study in Austria, the heating systems of 3 identical houses were monitored over a full heating season.

According to the measurements, the AT Heating Module produced the same amount of heat from 15.6% less electricity than the conventional electric boiler tested.

Important: the comparison was made with a conventional electric boiler, not with a heat pump.

The electricity consumption of a heat pump can generally be lower.

When comparing total costs, however, it is worth looking not only at the electricity bill, but also at the price of the appliance, the installation, regular servicing, spare part replacements and the expected service life.

The advantage of the AT Heating Module lies mainly in its simpler design, its few wear parts, its small footprint and its long service life.

Because the total cost of a heating system does not consist of a single monthly bill.

It also includes:

• the purchase price of the appliance,
• the installation,
• the maintenance,
• the repairs,
• the spare part replacements,
• the expected service life,
• and the energy consumption.

A system with lower consumption can still cost more overall if it is expensive to install, needs frequent maintenance or has to be replaced sooner.

With certain system designs, and depending on the applicable supply terms, it may be possible to use more favourable tariffs.

In many cases this requires heat storage.

With underfloor heating, the several tonnes of concrete can itself act as a heat store. In other systems, heat produced during the cheaper period can be stored in a buffer tank.

The exact tariff conditions and eligibility always have to be checked separately.

Not in every system.

With underfloor heating, the heated concrete mass itself has significant heat storage capacity.

In other arrangements, a 1,000, 1,500 or even 2,000 litre buffer tank can help you produce the heat during a cheaper period and use it later.

Whether it is needed can always be decided on the basis of the particular property and heating system.

Yes.

How economical it is, however, depends on the size of the solar system, the annual generation, the distribution of consumption over time and the current settlement arrangement.

For a property with solar panels we therefore prepare a separate calculation rather than giving a generic savings promise.

If you have the opportunity, it is worth reducing the building's heat loss first.

Better insulation can bring savings in 3 places:

• a lower-output heating module may be enough,
• a smaller solar system may be needed,
• and later energy consumption will be lower.

That is why, in a renovation, insulation is often a more important first step than the boiler replacement itself.

Yes, but this isn't the most economical solution in every case.

The AT Heating Module may be able to produce the water temperature needed for bathing directly, but with a small daily hot water demand a simple water heater can be the more economical choice.

For a larger family or a significant hot water demand, the maths with an indirect cylinder can be entirely different.

If one or two of you live in the property and you use little hot water, it often isn't worth using the more valuable heating module for just a short time each day for this.

In such cases a simple electric water heater can be the more rational solution.

We say this honestly even when selling a larger system would be more advantageous for us.

A water tank in which the water is not heated by a conventional electric element.

The AT Heating Module transfers the heat to the domestic hot water through a heat exchanger coil running inside the tank.

Since the output of the heating module can be far greater than the element of an average water heater, the water can be reheated more quickly.

With correct sizing, yes.

With a conventional water heater a larger tank is needed because reheating the water takes longer.

An AT Heating Module of adequate output with an indirect cylinder can replace the hot water used much faster, so for some families a smaller tank can be enough.

The exact size has to be determined from the size of the family and their usage habits.

The supply capacity required depends on the output of the chosen heating module and on the property's other electrical loads.

Before installation the following have to be checked:

• the available capacity,
• the number of phases,
• the arrangement of cables and protective devices,
• and whether the supply needs upgrading.

We clarify this before the order is placed.

Yes, it may.

If the property currently doesn't have the electrical capacity needed to run the heating module and the other household appliances at the same time, an upgrade may be required.

That is why it matters that the supply conditions don't only come to light on the day of installation.

The AT Heating Module burns no gas or other fuel, so it needs no chimney and no flue gas system.

No gas design work is required either.

The electrical connection and any supply upgrade, however, may require dealing with the utility or a qualified electrician.

The AT Heating Module itself needs no separate boiler room.

Because of its small size it can be placed, for example, in a wardrobe, under a washbasin, behind a kitchen counter or right next to the mechanical system.

Space does of course have to be provided for the other elements of the complete system — a larger buffer tank or indirect cylinder, for instance.

How long installation takes depends on whether it is a new build, a simple boiler replacement or a more complete mechanical rebuild.

Connecting to a properly prepared, existing water-based system can be far simpler than building a complete heating network.

The actual time needed can be determined after surveying the system.

The appliance has to be installed by professionals with the appropriate electrical and building services expertise.

It matters that the installer knows the hydraulic, control and electrical requirements of the system.

We provide technical information and consultation for professionals.

The main unit of the heating module contains no compressor, fan or other continuously moving mechanical part.

This reduces the maintenance that wear would otherwise require.

The other elements of the complete heating system — the circulation pump, the controls, the safety fittings and the water quality — do, however, have to be checked just as in any water-based system.

There are few points of failure in the main heating unit.

The appliance does, however, contain an electronic control board of about 10 × 7.5 centimetres. The electronic components on it can fail during the service life and may need replacing.

We don't hide this in the small print of the warranty conditions.

When designing the appliance we worked with an operating life of at least 25 years.

The long service life is made possible by the small number of wear parts and the simple design.

The actual service life is of course also affected by correct sizing, professional installation, the electrical environment and the condition of the complete heating system.

The 20-year replacement warranty covers the main unit of the AT Heating Module, subject to the conditions set out in the warranty document.

The same 20-year commitment does not apply to the electronic control board.

Before you buy, you can review exactly what the warranty covers, on what conditions and with what exclusions.

First it has to be established whether the fault arose in the main unit of the heating module, in the control board or in some other element of the heating system.

If the failure concerns the unit covered by the replacement warranty and the warranty conditions are met, we proceed according to the warranty.

The detailed procedure is set out in the warranty documentation.

More than 99% of the appliance is made of recyclable materials.

Because of its long service life and the few parts that need replacing, fewer appliances and components may end up as waste in the environment.

The environmental impact of operation, however, also depends on the source of the electricity used. We therefore do not claim that it is completely carbon neutral under all circumstances.

We generally ask for the following information:

• the floor area of the property,
• the main details of the insulation and the windows and doors,
• the ceiling height,
• the existing or planned heat emitter system,
• previous annual gas or energy consumption,
• the current capacity of the electrical supply,
• and the hot water demand.

The more accurate the data we get, the more reliable the recommendation we can give.

No.

The purpose of the consultation is first of all to establish whether the AT Heating Module could be a technically and economically suitable solution for your home.

If the figures show you'd be better off with another solution, we'll say that honestly too.

We go through the data you have sent and, if necessary, ask for further technical information.

We then determine the recommended appliance output, the electrical and mechanical conditions, and any additional components that may be needed.

On that basis you receive a specific output and system recommendation. Ordering comes afterwards, in the web shop or through your own contractor.

We organise open days and opportunities to see the appliance in person.

There you can hold the appliance, see it running, and put your technical questions directly.

We give information about the next opportunity after you register your interest.

A live video demonstration may also be possible.

In that case we don't show a pre-recorded promotional film: we show you the appliance live and you can ask your questions as we go.

This way you can satisfy yourself that it is a real, working product, without travelling.

Depending on the sites available and the consent of the customers, working installations may also be open to visits.

This always requires registering and arranging a time in advance.

We give information about the specific options after you register your interest.

Yes.

We provide a separate technical consultation option for contractors, building services designers, architects, resellers and other professional partners.

We go through sizing, installation, system integration and the terms of cooperation.